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Theoretical investigations of the interactions between carbon monoxide(CO)and bromopentafluorobenzene(C6F5Br)have been carried out at both M06-2X/6-311++G(2d,2p)and M06-2X/aug-cc-pVTZ levels of theory.Because both C and O atom-ends of CO show negative electrostatic potential,they can favorably interact with the positive electrostatic potential generated by the σ-hole of Br and π-hole of the aromatic ring of C6F5Br,yielding four different dimers and trimers.